Implement change root password function

Signed-off-by: Ramon Medeiros <ramonn@linux.vnet.ibm.com>
Let script more verbosity

Signed-off-by: Ramon Medeiros <ramonn@linux.vnet.ibm.com>
Remove error output from this command

Signed-off-by: Ramon Medeiros <ramonn@linux.vnet.ibm.com>